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[v4] OMAP: Fix for bus width which improves SD card's peformance.

Message ID s2l7f9d1ffb1004190836l9ba703c5lab13638d968a5c55@mail.gmail.com (mailing list archive)
State Superseded, archived
Headers show

Commit Message

kishore kadiyala April 19, 2010, 3:36 p.m. UTC
None
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Patch

diff --git a/drivers/mmc/host/omap_hsmmc.c b/drivers/mmc/host/omap_hsmmc.c
index 8c97c22..9c1a60e 100644
--- a/drivers/mmc/host/omap_hsmmc.c
+++ b/drivers/mmc/host/omap_hsmmc.c
@@ -2091,10 +2091,23 @@  static int __init omap_hsmmc_probe(struct
platform_device *pdev)
 	mmc->caps |= MMC_CAP_MMC_HIGHSPEED | MMC_CAP_SD_HIGHSPEED |
 		     MMC_CAP_WAIT_WHILE_BUSY;

-	if (mmc_slot(host).wires >= 8)
-		mmc->caps |= (MMC_CAP_8_BIT_DATA | MMC_CAP_4_BIT_DATA);
-	else if (mmc_slot(host).wires >= 4)
+	switch (mmc_slot(host).wires) {
+	case 8:
+		mmc->caps |= MMC_CAP_8_BIT_DATA;
+		/* Fall through */
+	case 4:
 		mmc->caps |= MMC_CAP_4_BIT_DATA;
+		break;
+	case 1:
+		/* Nothing to crib here */
+	case 0:
+		/* Assuming nothing was given by board, Core use's 1-Bit */
+		 break;
+	default:
+		/* Completely unexpected.. Core goes with 1-Bit Width */
+		dev_crit(mmc_dev(host->mmc), "Invalid width %d\n used!"
+			"using 1 instead\n", mmc_slot(host).wires);
+	}

 	if (mmc_slot(host).nonremovable)